I have a strange behavior on the desktop. When I start the notebook the first time I have a regular screen, after when I insert a USB pen the desktop changes color, the trash icon disappears and the other icons remain locked. If restarting Cinnamon the icons remain blocked but others appear out, the same that are no longer blocked, however the 3 icons remain blocked
System:
Linux Mint 18.2 Cinnamon 64-bit
Cinnamon ver. 3.4.6
kernel 4.13.0-43-generic